Accelerated Non-Volatile Memory Recirculation Processing

1. A system, comprising: a plurality of non-volatile random access memory blocks configured to store data; and a processor and logic integrated with and/or executable by the processor, the logic being configured to: receive a recirculation command; perform a coarse page lookup to determine valid ones of logical pages to be recirculated; request performance of a fine page lookup on physical pages of each block containing the valid logical pages to verify the valid logical pages; and send write commands corresponding to verified valid logical pages from the fine page lookup.

2. The system of claim 1 , wherein the coarse page lookup is performed using a page state table.

3. The system of claim 2 , wherein the page state table maintains a bit field for each codeword containing one or more of the logical pages.

4. The system of claim 3 , wherein each of the bit fields are used to determine one or more bits reflecting a status of the one or more logical pages contained in each codeword.

5. A method, comprising: receiving a recirculation command; performing a coarse page lookup to determine valid ones of logical pages to be recirculated; requesting performance of a fine page lookup on source physical addresses containing the valid logical pages to verify the valid logical pages; and sending write commands corresponding to verified valid logical pages from the fine page lookup.

6. The method of claim 5 , wherein the coarse page lookup is performed using a page state table.

7. The method of claim 6 , wherein the page state table includes a bit field for each codeword containing one or more of the logical pages.

8. The method of claim 7 , wherein each of the bit fields are used to determine one or more bits reflecting a status of the one or more logical pages contained in each codeword.

9. The method of claim 5 , wherein the fine page lookup includes cross-referencing a source physical address of the verified valid logical pages with a current physical address of the verified valid logical pages using a logical to physical table.

10. The method of claim 5 , wherein the coarse page lookup is performed using program instructions.

11. The method of claim 5 , wherein the request for a fine page lookup is sent to hardware.

12. The method of claim 5 , wherein the write commands are issued in a first-in-first-out manner.

13. A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions readable and/or executable by a controller to cause the controller to: receive, by the controller, a recirculation command; perform, by the controller, a coarse page lookup to determine valid ones of logical pages to be recirculated; request, by the controller, performance of a fine page lookup on physical pages of each block containing the valid logical pages to verify the valid logical pages; and send, by the controller, write commands corresponding to verified valid logical pages from the fine page lookup.

14. The computer program product of claim 13 , wherein the coarse page lookup is performed using a page state table.

15. The computer program product of claim 14 , wherein the page state table maintains a bit field for each codeword containing one or more of the logical pages.

16. The computer program product of claim 15 , wherein each of the bit fields are used to determine one or more bits reflecting a status of the one or more logical pages contained in each codeword.

17. The computer program product of claim 13 , wherein the fine page lookup is performed using a logical to physical table.

18. The computer program product of claim 13 , wherein the coarse page lookup is performed using program instructions.

19. The computer program product of claim 13 , wherein the request for a fine page lookup is sent to hardware.

20. The computer program product of claim 13 , wherein the write commands are issued in a first-in-first-out manner.